Governor or for explosive-engines.



No. 640,97]. Patented m. 9, 1900.

A. c. STEWART.

GDVERNOR FUR EXPLOSIVE ENGINES.

(Application filed Mar. 16, 1898.

(No Model) STATES PATENT OFFICE.

ALFRED CLEMENT STEWART, OF SANTA PAULA, CALIFORNIA.

GOVERNOR FOR EXPLOSIVE-ENGINES.

SPECIFICATION forming part of Letters Patent No. 640,971, dated January9, 1900.-

Application filed March 16,1898.

To all whom it may concern.-

Be it known that I, ALFRED CLEMENT STEW ART, a citizen of the UnitedStates, residing at Santa Paula, in the county of Ventura and State ofCalifornia, have invented a new and useful Governor forExplosive-Engines, of which the following is a specification.

This invention relates to governors which operate by controlling theexhaust.

The objects of this invention are extreme simplicity of construction andextreme sensitiveness of action.

My invention comprises, in an explosive-engine, the combination,with theexhaust-valve mechanism, of a cam-arm, means connecting such arm withthe valve to open the valve, a catch for holding the arm in open-valveposition, a-cam-wheel with cam to operate the arm, means for retractingthe catch to release the arm when it is thrown by the cam, and acentrifugal block carried by the cam-wheel, to be thrown by speed abovenormal, to hold the catch in operative position to hold the arm when thecam leaves it, a spring for throwing the centrifugal block toward thecenter of rotation of the wheel, and a jam-nut on the post for adjustingthe tension of the spring. By this arrangement when the speed of theengine exceeds the normal the governor is easily regulated. Thus toovercome the spring which presses the centrifugal block inward the blockflies out and holds the catch in position to hold the exhaust-valve openafter the cam has left the arm, so that the explosive charge will not.be admitted into the explosive-chamber until the speed has fallensufficiently to allow the centrifugal block to more back under thespring-pressure out of the way of the catch, so that the catch can againrelease the arm to allow it to permit the exhaust-valve to close.

The accompanying drawings illustrate my invention.

Figure 1 is a plan showing my newly-invented-governor as applied to agas-engine, a fragment of which is shown. Fig. 2 is a side elevation ofthe same with parts broken away to expose working mechanism. Fig. 3

is afragmental detail looking downward from line 3 3, Fig. l.

A indicates in a general way the exhaustvalve mechanism, which is thesame as that Serial No. 674,061. (No model.)

vided with a cam e to operate the cam-arm.

cl indicates a spring for retracting the catch to release the cam-armwhen it is thrown by the cam e. The spring a of the exhaust- Valveacting on the exhaust-valve rod a, the

rock-arm O, and rock-shaft C afiords means for yieldingly holding thecam-arm fully in the path of the cam, but the catch is arranged forholding the cam-arm only partially across the path of the cam. The catchcomprises a pivoted arm with a shoulder d on it to catch on a shoulder bon the cam-arm toward and from which the catch-arm d plays.

b indicates an antifriction-roller on the camarm B, which receives thestroke of the cam e, and in practice when the catch holds the cam-armthe roller 12 is just within the path of the cam e, so that when the campasses the roller it throws the cam-arm sufficiently to release thecatch. The catch and shoulder are slightly hook-shaped to hook into eachother, and the movement of the cam-arm when acted upon by the cam issirfficient to release the hook-faces. The shoulder b, which catches inthe notch of the catch-arm, is preferably a against the action of thespring h" the face. h engages the catch-arm D and holds it in positionto catch the shoulder or dog I) when the cam has passed the roller, thusallowing the dog again to seat in the notch of the catch. By this meanswhen the speed of the engine is sufficient to throw the centrifugalblock out the cam-arm will be held by the catch in position to hold theexhaust-valve open, thus to prevent the air-pressure on the inlet-valvefrom working the valve to cause the admission of an explosive chargeinto the engine.

By securing the spring and the block upon the same side of the center ofthe Wheel and providing the edge of the weight where the spring bearsagainst it with a curve or shoulder the weight can be assembled with theother parts just as it comes from the mold and the spring can be formedfrom a suitable piece of spring metal having an eye at one end and acrook at the other, thereby making a very cheap and efiicientconstruction.

The spring-post h' screws through the camwheel and is held by a jam-nuth on its opposite end. By this means the tension of the spring to holdthe centrifugal block inward is adjustable, so that the governor canbeset for a higher or lower speed by increasing or diminishing thetension of the spring.

Now, having described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In an explosive-engine, the combination, with the exhaust-valvemechanism; of means for operating the same; a catch for holding saidmeans inoperative; a cam-wheel adjacent to the catch; a centrifugalblock pivotally secured to the wheel to engage the catch; a springsecured to the same side of the center of the wheel as the block; thefree end of the spring being formed into an L and engaging with theblock; and means for ad justing the tension of the spring.

2. In an explosive-engine, the combination, with the exhaust-valvemechanism; of means for operating the same; a catch for holding saidmeans inoperative; a cam-wheel adjacent to the catch and provided with ascrewthreaded opening; a centrifugal block pivotally secured to thewheel to engage with the catch; a spring, one end of which is providedwith an eye and the other end engages with the block; a bolt through theeye and the screw-threaded opening of the wheel for adjusting thetension of the spring; and ajamnut for holding the bolt against movementafter the spring has been adjusted.

ALFRED CLEMENT STEWART.

Witnesses:

JAMEs R. TOWNSEND, W. J. TRAVERS.

